Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A positive electrode sheet and a lithium-ion battery containing the positive electrode sheet

A positive electrode sheet and positive current collector technology, which is applied in the field of lithium batteries, can solve the problems of restricting the development, transformation, and inability to advance of the battery cell, and achieve excellent electrical performance, small percolation threshold, and improved safety.

Active Publication Date: 2021-08-03
ZHUHAI COSMX BATTERY CO LTD
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the safety of battery cells has become a challenge and opportunity for subsequent development. Only by taking into account both safety and electrical performance can we gain a foothold and develop in the lithium-ion battery industry, otherwise the lithium-ion battery will become an untimely "bomb" in our hands and cannot move forward. , hold back
[0003] The current methods to improve the safety of lithium-ion batteries are all at the expense of the electrical performance of lithium-ion batteries, which greatly restricts the development of batteries

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A positive electrode sheet and a lithium-ion battery containing the positive electrode sheet
  • A positive electrode sheet and a lithium-ion battery containing the positive electrode sheet
  • A positive electrode sheet and a lithium-ion battery containing the positive electrode sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Lithium cobaltate (particle size is D 50 =3.8-4.2μm): polyvinylidene fluoride (molecular weight is between 1 million and 1.1 million, recorded as 1 million): carbon black (specific surface area is 65m 2 / g) is mixed according to the mass ratio of 88.5:10:1.5, dissolved in NMP, stirred evenly with a ball mill at high speed, coated on a 10 μm thick aluminum foil with a coater, dried to remove NMP, and obtained figure 1 Positive electrode sheet of medium security coating 2, aluminum foil 3, and security coating 2. The thickness of the single-layer security coating is about 15 μm.

[0063] Lithium cobaltate (particle size is D 50 =15-16μm): polyvinylidene fluoride (molecular weight is between 800,000 and 900,000, denoted as 800,000): carbon black (specific surface area is 150m 2 / g) is mixed according to the mass ratio of 97.8:1.1:1.1, dissolved in NMP, stirred evenly with a ball mill at high speed, coated on the safety coating with a coater, dried to remove NMP, and obt...

Embodiment 2

[0066] Others are the same as in Example 1, the difference is that lithium cobaltate: polyvinylidene fluoride: carbon black is mixed according to the mass ratio of 88:10:2 in the safety coating.

Embodiment 3

[0068] Others are the same as in Example 1, except that lithium cobaltate: polyvinylidene fluoride: carbon black in the safety coating is mixed in a mass ratio of 87.5:10:2.5.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention provides a positive electrode sheet and a lithium ion battery containing the positive electrode sheet. The invention improves the safety of the electric core by controlling the safety coating coated on the surface of the positive current collector and the percolation threshold of the positive active material layer, while ensuring higher energy density and excellent electrical performance. In particular, the percolation threshold of the positive electrode active material layer is small, and the addition of a small amount of conductive agent can not only ensure a good electron path, but also increase the energy density of the positive electrode sheet.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a positive electrode sheet and a lithium ion battery containing the positive electrode sheet. Background technique [0002] As a new energy product, lithium-ion batteries are widely used in home appliances, mobile phones, and wearable devices. With the wider range of applications, our daily life has been closely linked with lithium-ion batteries. With the rapid development of the lithium battery industry, lithium-ion batteries have made great achievements in terms of capacity, fast charging, and cycle life. , and in continuous research and development, and the higher and higher battery capacity and faster charging time mean that the battery has more energy. Once an internal / external short circuit occurs, the damage will be greater. Therefore, the safety of battery cells has become a challenge and opportunity for subsequent development. Only by taking into account both ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525H01M10/42
CPCH01M4/623H01M4/624H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 徐昕彭冲李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com